scholarly journals Variation on sandbar of tributary in Xiaolangdi Reservoir on Yellow River, China

2018 ◽  
Vol 246 ◽  
pp. 01019
Author(s):  
Tao Li ◽  
Jun-hua Zhang ◽  
Guoming Gao ◽  
Huaibao Ma
Keyword(s):  
Flood Control ◽  
Yellow River ◽  
Deposition Process ◽  
Utilization Efficiency ◽  
Comprehensive Utilization ◽  
Water And Sediment ◽  
River Bed ◽  
Main River ◽  
Effective Use ◽  
Xiaolangdi Reservoir

Sandbar development would stop the water and sediment exchange between main river and tributary and even influence the normal reservoir opeartion. From the surveyed data of reservoir built many years ago, it shows that when there is a bar in tributary mouth, the tributary volume below the bar will become nullification during the period of flood control or water and sediment regulation of reservoir. There are more tributaries in Xiaolangdi reservoir than the others that it occupies 41.3% of the total initial volume of tributary volume. Obviously, the effective use of tributary volume has been important influenced by comprehensive utilization efficiency of reservoir scheduling, such as flood control, sedimentation reduction and comprehensive utilization. Results of Xiaolangdi Reservoir mobile-bed physical model experiments show that tributary is equivalent to lateral extension of river bed, the tributary intrusion deposition process have strongly relations with the factors, such as original topography, river bed deposition shape and its regime, process with input discharge and input sediment, and method of reservoir regulation. The variation trends of main river and tributary terrain forecasted by model test are basically in accordance with field surveyed data. The results could be used for research, design, and forecasting of reservoirs in sediment-laden river.

Test Studyed of Yangjiawan Grand Bridge in the Project of Lanyu Railway by Movable Bed Model

2012 ◽  
Vol 204-208 ◽  
pp. 2070-2073
Author(s):  
Wen She He ◽  
Long Yuan ◽  
Shuang Mei Chang ◽  
Jing Jing Feng ◽  
Liang Ming Wang
Keyword(s):  
Flood Control ◽  
Yellow River ◽  
Flow Direction ◽  
Bridge Site ◽  
Design Data ◽  
Lanzhou City ◽  
Bed Topography ◽  
River Bed ◽  
Before And After ◽  
Movable Bed

Yangjiawan grand bridge is located in Lanzhou section of the Yellow River. In order to study the change laws near the bridge site of flow direction, velocity distribution, water surface slope, backwater area, river bed topography change and the effect of flood control on Lanzhou city after the bridge-built when the river gets through the average discharge, 20-year discharge, and 100-year discharge before and after the bridge-built. Based on the similar principle of model, the river near the bridge site was simulated by the hydraulic model experiment of movable bed. The result of experiment showed that the design data adopted in bridge project of Yangjiawan grand bridge were reasonable and fulfilled the requirements of city flood control. It was also suggested to excavate and dredge river near the piers of 6# ~11# and strengthen embankment near the riverbank and protection of constructions after the bridge-built.

scholarly journals Research Progress on Causes and natural cut-off of distorted river bends

2018 ◽  
Vol 246 ◽  
pp. 01095
Author(s):  
ZHAO Wanjie ◽  
XU Linjuan ◽  
LI Junhua ◽  
WANG Yuanjian ◽  
JIANG Enhui
Keyword(s):  
Flood Control ◽  
Yellow River ◽  
Research Progress ◽  
Main Stream ◽  
Control Engineering ◽  
The Lower Yellow River ◽  
River Bed ◽  
Plane Shape ◽  
River Bends ◽  
Important Position

In recent years, the distorted river bends occurs frequently in the lower reaches of the Yellow River, and the critical catastrophe occurs of natural cut-off under the action of flood scouring during flood season, which directly affects the plane shape of the river channel and the flood control safety of local reach. By collecting a large number of literature and combining existing research results, the causes of the deformed rivers and the natural cutting phenomenon are reviewed. The formation of the distorted river bends is mainly related to the incompatibility of the upstream water and sediment inflow conditions with the river boundary conditions, the formation of local anti-scour nodes (such as clay mouth) and the emergence or control engineering, and the different anti-scour properties of the riverbed leading to the main stream swing. In the development and evolution process of river bays, natural cutting curve occupies an important position, and there are three typical forms, such as erosion ditch type, bank collapsing type and die cutting type, and its cutting ratio is 1.6-6.9. In the future, we should study the composition of the river bed, study the causes and mechanism of the abnormal river regime in the lower Yellow River more deeply, predict the trend of the abnormal river regime scientifically, and evaluate the damage.

Analysis and Prediction for Xiaolangdi Reservoir Sand Blocking Operation Period and Water Level of the Lower Yellow River

2011 ◽  
Vol 71-78 ◽  
pp. 1318-1323 ◽  
Author(s):  
Qing An Li ◽  
Han Dong Liu ◽  
Yu Kun Zhao
Keyword(s):  
Water Level ◽  
Flood Control ◽  
Yellow River ◽  
River Channel ◽  
The Yellow River ◽  
Deposition Condition ◽  
Reservoir Water ◽  
Specific Flow ◽  
Operation Period ◽  
Xiaolangdi Reservoir

Xiaolangdi Reservoir undertakes 90% of the Yellow River runoff and 100% of sediment discharge. To ensure the long-term utilization of Xiaolangdi reservoir is the key to prevent the flood in the lower reaches of the Yellow River. Take Luokou Hydrologic Station located in the lower reaches of the Yellow River as an example, conduct an analysis from the aspects of sediment retaining of Xiaolangdi Reservoir, scouring and deposition condition of river channel in the lower reaches of the Yellow River, water level performance for years of different flow of ten times’ water-sediment regulation, predict on the sand blocking operation period of Xiaolangdi Reservoir, water level of specific flow of river channel in the lower reaches of the Yellow River and scouring and deposition condition of river channel, which has played a reference role for the flood control in the lower reaches of the Yellow River.

Theoretical Investigation into Plunging Point of Density Current in Reservoir

2012 ◽  
Vol 212-213 ◽  
pp. 413-416
Author(s):  
Tao Li ◽  
Guo Ming Gao ◽  
Huai Bao Ma ◽  
Ting Wang
Keyword(s):  
Froude Number ◽  
Taylor Series ◽  
Yellow River ◽  
Sediment Concentration ◽  
Density Current ◽  
Correction Coefficient ◽  
Water And Sediment ◽  
Current Design ◽  
Xiaolangdi Reservoir ◽  
Water And Sediment Regulation

The study of the beginning of the density current is the first formation of density current. The relation formula for gravitational correction coefficient had been derived on Taylor series. Then the explicit changing formula between Froude number and sediment concentration had been obtained. Analysis and discussion about the formula had been carried out. With the data surveyed from Xiaolangdi Reservoir had been validated on the coefficient. The results show that the formula can support Xiaolangdi reservoir for the density current design of water and sediment regulation on Yellow River.

scholarly journals Geoengineering conditions of the environmental protection facilities in the centre of the Oder River

2018 ◽  
Vol 45 ◽  
pp. 00023
Author(s):  
Magda Hudak ◽  
Urszula Kołodziejczyk ◽  
Jakub Kostecki
Keyword(s):  
Catchment Area ◽  
Flood Control ◽  
Negative Impact ◽  
Flood Damage ◽  
Control Measures ◽  
River Bed ◽  
Main River ◽  
Oder River ◽  
River Valleys ◽  
Sedimentation Processes

The ongoing management of river valleys has had a negative impact on the effectiveness of flood protection of former floodplains. The risk of flooding and flood damage is constantly increasing. As a result of disorganized industrialization, we are dealing with the accumulation of precipitation which flows much faster from the catchment area to the main river. In turn, due to erosion and the sedimentation processes, the capacity of the main river bed and its tributaries is limited. The solution to the problem may be multidirectional flood control measures, which were designed for the Lubuskie part of the Oder River, from Nowa Sól to Milsko. They concern: the construction of a flood wall in Nowa Sól, the modernization of the flood embankments in the Nowa Sol area and reconstruction of the former floodplain in Milsko. The paper presents the geoengineering conditions of these projects.

Evaluation of water resources comprehensive utilization efficiency in the Yellow River Basin

2016 ◽  
Vol 16 (6) ◽  
pp. 1561-1570 ◽  
Author(s):  
Xin-jian Guan ◽  
Sheng-xing Liang ◽  
Yu Meng
Keyword(s):  
Water Resources ◽  
River Basin ◽  
Yellow River ◽  
Yellow River Basin ◽  
Gansu Province ◽  
Evaluation Index System ◽  
Utilization Efficiency ◽  
The Yellow River ◽  
Comprehensive Utilization ◽  
The Yellow River Basin

This study investigated appropriate indicators using the trapezoidal fuzzy number method, and constructed an evaluation index system for water resources comprehensive utilization efficiency (WRCUE). A WRCUE evaluation model is applied to areas in the Yellow River Basin in China using a genetic projection pursuit method. Results show that WRCUE is well developed in Shanxi, Shandong, and Henan provinces, moderately developed in Shanxi, Inner Mongolia, and Sichuan provinces, and poorly developed in the Ningxia Autonomous Region, Gansu Province, and Qinghai Province. According to the capacities of provinces, related measures are proposed.

The Capability Analysis of Flood Discharge in Ningmeng of Yellow River

2012 ◽  
Vol 212-213 ◽  
pp. 705-709
Author(s):  
Xin Ai Jing ◽  
Xiu Zhi Lin ◽  
Su Zhen Hou ◽  
Gen Li Liu
Keyword(s):  
Flood Control ◽  
Yellow River ◽  
Main Channel ◽  
Water Level Rise ◽  
Flow Duration ◽  
Bankfull Discharge ◽  
Water And Sediment ◽  
Capability Analysis ◽  
Small Flow ◽  
Control Decision

the amount of water and sediment reduce obviously in Ning Meng reach because of the influence of the regulation of Long-Liu reservoir in upper of Yellow River、rainfall and production and living use water, especially the time reduce of large flows and the growth of small flow duration time, resulting main channel siltation and atrophy severe in the Inner Mongolia Reach, lower bankfull discharge, the main channel flooding capacity decreased when the great flood of water level rise, resulting in the increase of the river's ice flood control pressure. The study will provide technical support for flood control decision-making.

Study on Drag Reduction of Suspended Flow with Extra Fine Sediment

2010 ◽  
Vol 439-440 ◽  
pp. 1567-1571
Author(s):  
Chang Jun Zhu
Keyword(s):  
Drag Reduction ◽  
Water Level ◽  
Flood Control ◽  
Yellow River ◽  
Reduction Rate ◽  
Fine Sediment ◽  
Flood Peak ◽  
The Lower Yellow River ◽  
Abnormal Phenomenon ◽  
Xiaolangdi Reservoir

In view of the abnormal phenomenon that a flood peak increased in August 2004 and July 2005 along the lower Yellow River, the mechanism of this abnormal phenomenon is studied. It is found that the flood increase was due to the decrease the channel roughness in the propagation of high concentrated flood carrying the extra fine sediment which was discharged from xiaolangdi reservoir. In view of this, the equation of drag reduction rate is derivated under variable k pattern, and is applied to the reality. The results show that the equation is reliable and has important role in flood control and calculation in water level with hyperconcentration flow. The study of this paper only is a try and discuusion, and need to be improved.

scholarly journals Influence of Floodplain Flooding on Channel Siltation Adjustment under the Effect of Vegetation on a Meandering Riverine Beach

Water ◽  
2021 ◽  
Vol 13 (10) ◽  
pp. 1402
Author(s):  
Li Junhua ◽  
Zhang Mingwu ◽  
Jiang Enhui ◽  
Pan Li ◽  
Wang Aoxue ◽  
...  
Keyword(s):  
Model Test ◽  
Flood Control ◽  
Yellow River ◽  
Main Channel ◽  
Experimental Simulation ◽  
Theoretical Research ◽  
Main Stream ◽  
Compound Channel ◽  
Water And Sediment ◽  
Beach Vegetation

Flooding in a sediment-laden floodplain is affected by riverine beach vegetation and the shape of a meandering compound channel. The laws of water and sediment exchange and the deposition distribution in beach troughs are very complex. These factors play a significant role in the formation and development of secondary suspended rivers, in the adjustment of the beach horizontal gradient, and even in the evolution of the flood control situation. In this study, we used a combination of experimental simulation and theoretical research to carry out a generalized model test of floodplain flooding evolution, analyzed the lateral distribution characteristics of sediment-laden flow and sediment factors in a meandering compound channel under the conditions of beach vegetation, and revealed the pros and cons of beach vegetation on the adjustment of the beach and channel siltation. The model test results of the flooding in the floodplain in the compound channel with meandering vegetation showed that the main stream was not only concentrated in the main channel but also appeared near the foot of the left and right bank levees and formed flood discharges along the embankment. As the riverine beach siltation was mainly concentrated at the riverine beach lip, the vegetation on the riverine beach had a significant effect on slowing down the flow velocity. Whether it was a row or full vegetation on both sides of the bank, this played an important role in the stability of the main channel. When there was no vegetation on the riverine beach, the main channel was easy to move. The arrangement of full vegetation on the riverine beach had a uniform effect on the velocity distribution of the riverine beach, which reduced the phenomenon of excessive velocity at the foot of the riverine beach and increased the velocity effect in the main channel. These results will provide a theoretical basis for the utilization of riverine beach areas and river management in the lower Yellow River and have a great significance for enriching the basic theory of water and sediment movement and promoting the integration of hydraulics, river dynamics, and ecology.

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